CN112176132A - Resource utilization process for utilizing steelmaking production in cooperation with waste asbestos - Google Patents
Resource utilization process for utilizing steelmaking production in cooperation with waste asbestos Download PDFInfo
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- CN112176132A CN112176132A CN202011025860.2A CN202011025860A CN112176132A CN 112176132 A CN112176132 A CN 112176132A CN 202011025860 A CN202011025860 A CN 202011025860A CN 112176132 A CN112176132 A CN 112176132A
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- slag
- pressing
- waste
- asbestos
- defoaming
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a resource utilization process for utilizing steelmaking production to cooperate with waste asbestos, which is implemented according to the following process steps: 1) firstly, asbestos waste, waste grease and waste steel slag fine particles with the granularity of 0.75 mm-10 mm are mixed according to the mass percentage of 35: 10: 55 for 30min, and then pressing the mixture into a sphere with the diameter of 5-30 mm on a high-pressure dry powder ball press; 2) the spheres are transported to a steelmaking process platform by pulling to be used as slag-pressing defoaming agents for standby; 3) in the slag discharging process of a converter or an electric furnace, adding the slag pressing defoaming agent into a slag pot for slag pressing defoaming, wherein the dosage of the slag pressing defoaming agent is 3-5 kg per ton of steel; 4) and (3) treating the converter or electric furnace steel slag added with the slag pressing defoaming agent according to a normal process flow. The invention realizes the harmless conversion of waste grease and asbestos while solving the problem of slag pressing and defoaming in the converter steelmaking slag tapping process.
Description
Technical Field
The invention belongs to the technical field of resource utilization of hazardous wastes and ferrous metallurgy, and relates to a resource utilization process for utilizing steelmaking production to cooperate with waste asbestos.
Background
Asbestos is an important mineral raw material in the national economic construction process, has the advantages of heat insulation, acid and alkali corrosion resistance, insulation and the like, and is widely applied to the fields of mechanical industry, refractory material industry, automobile manufacturing industry and the like. The existing research and literature prove that asbestos can cause pulmonary fibrosis and lung and pleural tumors. Therefore, the waste asbestos is classified as dangerous waste in China, the national dangerous waste catalogue contains 9 categories of HW36 asbestos waste, such as 262-. The inventor has found, according to research and study, asbestos, a hydrous silicate mineral. The chemical composition of the material is 3 MgO.2SiO2·2H2O or MgO [ Si ]4O10](OH)8The animal harm is caused by the disease after asbestos fiber enters the human body after the asbestos fiber is contacted. Most of the waste industrial asbestos is mainly fibrous and granular, and is mixed with partial grease and the like.
In the middle of the paper entitled "current situation of asbestos tailings and research progress of resource utilization" published in "the journal of non-metal mining industry" of china, 2007 3 rd of the consulting literature (1), santo zhu hong, zheng shui lin, there are the following contents: "the asbestos tailings in China are accumulated in large quantities, and cause great pollution to the environment. Since the 90 s of the 20 th century, Chinese scientists have made some research on the comprehensive utilization of asbestos tailings, but so far, although some development projects have good application prospects, the industrial utilization is slow in progress, and even no content expression of high-efficiency industrial comprehensive utilization in the true sense exists; (2) the intermediate of the paper entitled "research progress on resource utilization of chrysotile and tailings" published in "journal of non-metallic mineral industry in china" 2014 4 of Wuchunxiang, Song Peng Cheng Juan, Peng Tong Jiang, has the following content: the chrysotile tailings belong to industrial solid wastes, although valuable components are deeply extracted and researched, the chrysotile tailings are not subjected to industrial production except pilot plant tests in Gansu Aksai and Xinjiang Yigulong Brack industrial parks, and the production process needs to be solved, such as the volatilization of ammonia water, the pollution of sulfuric acid to instruments and environment and the like. "is expressed in terms of content; (3) in the middle of the paper entitled "harmfulness and comprehensive utilization approach of asbestos tailings" published in journal of "comprehensive utilization of mineral products" of date 1 of 2009, Suqingping and Ding Ling, there are a lot of unselected fine short fibers contained in asbestos tailings, and these short fibers drift with wind, causing damage to air quality. In recent years, with the development of high-temperature plasma technology, high-temperature crystallization technology of asbestos waste has been developed in developed countries such as italy and france, and the technology is described as a content of converting asbestos waste into wear-resistant and corrosion-resistant glass ceramic without melting at high temperature and then taking on a fibrous form. The documents show that no technological method for treating waste asbestos in steel-making production exists at present.
In the process of converter steelmaking and electric furnace steelmaking, slag needs to be discharged from a slag pot in the smelting process, the temperature of the slag is more than 1600 ℃, the alkalinity is more than 2.0, the slag contains about 20 percent of iron oxide, and in the slag discharging process, because iron beads and the like are dispersed in the slag, carbon in the iron beads reacts with FeO in the slag to generate a large amount of CO/CO2The bubble causes the slag in the slag pot to overflow the slag pot, causes the damage to the slag pot car, and in this process, the steelmaking process needs to add the slag pressing agent into the slag pot, and the main principle of the slag pressing agent is to reduce the temperature in the slag pot, reduce the reaction, and adopt the cold state material to carry out two kinds of technological methods of physics defoaming to the foam slag. Most of the slag pressing agents in the process are produced by adding a small amount of carbonaceous materials into clay materials, and the cost of each ton is about 800 yuan.
In the mechanical processing and petrochemical industry, a certain amount of waste heavy metal element-containing grease is also dangerous waste, and the inventor finds that 12 waste greases between HW08 types 900-199-08-900-214-08 in the national dangerous waste catalogue have toxic dangerous factors mainly including metal pollution, the waste greases have high treatment cost and are difficult to be recycled, and the method is one of the treatment problems in the industry.
Disclosure of Invention
The invention aims to provide a resource utilization process for utilizing steelmaking production in cooperation with waste asbestos, which solves the problem of slag pressing and defoaming in the converter steelmaking slag tapping process and realizes harmless conversion of waste grease and asbestos.
The invention aims to realize the resource utilization process of utilizing the steelmaking production to cooperate with the waste asbestos, which is implemented according to the following process steps:
1) firstly, asbestos waste, waste grease and waste steel slag fine particles with the granularity of 0.75 mm-10 mm are mixed according to the mass percentage of 35: 10: 55 for 30min, and then pressing the mixture into a sphere with the diameter of 5-30 mm on a high-pressure dry powder ball press; 2) the spheres are transported to a steelmaking process platform by pulling to be used as slag-pressing defoaming agents for standby; 3) in the slag discharging process of a converter or an electric furnace, adding the slag pressing defoaming agent into a slag pot for slag pressing defoaming, wherein the dosage of the slag pressing defoaming agent is 3-5 kg per ton of steel; 4) and (3) treating the converter or electric furnace steel slag added with the slag pressing defoaming agent according to a normal process flow.
The technical principle of the invention is based on the following innovation points:
1) the waste grease is used as a binder, and the asbestos and the steel slag are produced into the slag pressing defoaming agent.
2) C, H generated by cracking the grease at about 960 ℃ reacts with FeO in the slag to achieve the purpose of chemical defoaming;
3) the cold-state steel slag has the characteristic of large heat capacity, and the converter liquid steel slag is physically defoamed.
4) The crystal water in the asbestos is heated to 600-700 ℃ to generate a dehydration reaction of the crystal water, and the generated water is cracked or vaporized to form gas which enters the foam slag to achieve the technical purpose of enhancing the gas pressure in the bubbles to achieve defoaming.
5) Various substances in the asbestos generate slagging reaction in the liquid converter steel slag to form new substances, the fiber characteristics of the asbestos disappear, and harmless conversion is realized.
6) In the steel slag treatment process, in the magnetic separation process of the steel slag, most of metal and non-metal oxides are magnetically separated, and are recycled with iron-containing substances in the steel slag in a steel mill, and the non-recovered parts enter the steel slag.
The key chemical reactions of the invention are as follows:
1. the asbestos harmless conversion reaction is as follows:
MgO[Si4O10](OH)8→3MgO·2SiO2+2H2o (liquid steel slag medium thermal decomposition)
3MgO·2SiO2→3MgO+2SiO2(local reaction in the submerged arc furnace 1898 ℃ range[ Chenxiang data album 653 page]）
MgO·SiO2（s）→MgO·SiO2（l）(reaction temperature of the stevensite liquefaction is 1577 DEG C[ Chenxiang data album 653 page]）
MgO·SiO2（s）→MgO（s）+SiO2（s） (decomposition reaction in solid state at a reaction temperature of 25 to 1898 ℃ C.)
After the substances are changed, the substances enter steel slag which is the over-burnt portland cement clinker, so that the original harmful characteristics of asbestos fibers are eliminated, and harmless conversion is realized.
2. Harmless conversion of grease
CxHyCOOCnHm+Q→(x+n) C+(y+m) H+H2O
C+NiO=Ni+CO
NiO + C = Ni + CO
CoO+C=Co+CO
Cr2O3+3C=2Cr+3CO
FeO+C=Fe+CO
Fe2O3+3C=2Fe+3CO
Wherein, the metal and the metal oxide are used as iron-containing raw materials in the magnetic separation process of the steel slag to be recycled in the steel-making or iron-making process.
The inventor discovers that the specific gravity of the steel slag fine particle (0.75-10 mm) material is 3.1t/m according to the metallurgical principle3Since it has good adhesion to grease, the inventors have made reference to waste asbestosThe material characteristics and the defoaming technology of the converter slag pot are developed, the waste asbestos is used as fiber aggregate, the waste grease is used as a binder, and the waste oil is produced into a slag pressing defoaming agent in the steelmaking slag discharging process for application, so that the problem of slag pressing defoaming in the converter steelmaking slag discharging process is solved, and simultaneously, the harmless conversion of the waste oil and the asbestos is realized. The invention takes the waste asbestos as an additive, takes the waste grease as a binder, and is produced together with the converter steel slag to be used as a slag pressing defoaming material in the converter steel making process.
Detailed Description
The invention is illustrated by the production example of Xinjiang mutual power, good source and environmental protection science and technology company Limited:
a resource utilization process for utilizing steelmaking production to cooperate with waste asbestos is implemented according to the following process steps:
1) firstly, asbestos waste, waste grease and waste steel slag fine particles with the granularity of 0.75 mm-10 mm are mixed according to the mass percentage of 35: 10: 55 for 30min, and then pressing the mixture into a sphere with the diameter of 5-30 mm on a high-pressure dry powder ball press;
2) the spheres are transported to a steelmaking process platform by pulling to be used as slag-pressing defoaming agents for standby;
3) in the slag discharging process of a converter or an electric furnace, adding the slag pressing defoaming agent into a slag pot for slag pressing defoaming, wherein the dosage of the slag pressing defoaming agent is 3-5 kg per ton of steel;
4) and (3) treating the converter or electric furnace steel slag added with the slag pressing defoaming agent according to a normal process flow.
Claims (1)
1. A resource utilization process for utilizing steelmaking production to cooperate with waste asbestos is characterized in that: the process is implemented according to the following process steps: 1) firstly, asbestos waste, waste grease and waste steel slag fine particles with the granularity of 0.75 mm-10 mm are mixed according to the mass percentage of 35: 10: 55 for 30min, and then pressing the mixture into a sphere with the diameter of 5-30 mm on a high-pressure dry powder ball press; 2) the spheres are transported to a steelmaking process platform by pulling to be used as slag-pressing defoaming agents for standby; 3) in the slag discharging process of a converter or an electric furnace, adding the slag pressing defoaming agent into a slag pot for slag pressing defoaming, wherein the dosage of the slag pressing defoaming agent is 3-5 kg per ton of steel; 4) the converter or electric furnace steel slag added with the slag pressing defoaming agent is processed according to the normal process flow.
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| CN202011025860.2A CN112176132B (en) | 2020-09-25 | 2020-09-25 | Resource utilization process for utilizing steelmaking production in cooperation with waste asbestos |
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